PURPOSE: To reduce the chip size for integration and to decrease the power consumption, by diviidng the voltage of an input signal by a voltage dividing means, sampling the output of division, charging the sampling output to a switched capacitor and then integrating the electric charge which is charged in a fixed period.
CONSTITUTION: The division of voltage is carried out to an analog signal supplied from an input terminal 1 by resistances 51 and 52, and this analog signal is applied to a switched capacitor 40 via a switch S1. The output of the capacitor 40 is applied to a switching capacitor 41 as well as to an arithmetic amplifier A1 via a switch S2 to be sampled. This sampling output is applied to a switching capacitor 44 via a switch S3. The output of the capacitor 44 is applied to a switching capacitor 45 as well as to an arithmetic amplifier A2 via a switch S4. Then the electric charge which is charged to the capacitors 41 and 43 in a fixed period is integrated by an integrating capacitor 46 and resistances 53 and 54, and the filter output is delivered to an output terminal 2. Then the power consumption is reduced for integration.
| JP3802968 | BAND-PASS FILTER DEVICE |
| JPS6416010 | SWITCHED CAPACITOR FILTER |
KURAISHI YOSHIAKI
NAKAYAMA KENJI
KIMURA TADAKATSU
NIPPON TELEGRAPH & TELEPHONE
| JPS5799816A | 1982-06-21 |